Stress can result in more headaches as a result of the body rerouting blood flow to other parts of the body.
92
The human eye blinks an average of 4,200,000 times a year.
233
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
Early American humans hunted car-size armadillos and used their shells for houses.
12
The world's shortest man measures only 21.5 inches.
73